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199"""
Flask App Context - Flask implementation of AppContext interface.
"""
import contextvars
from collections.abc import Generator
from contextlib import contextmanager
from typing import Any, final
from flask import Flask, current_app, g
from context import register_context_capturer
from core.workflow.context.execution_context import (
AppContext,
IExecutionContext,
)
@final
class FlaskAppContext(AppContext):
"""
Flask implementation of AppContext.
This adapts Flask's app context to the AppContext interface.
"""
def __init__(self, flask_app: Flask) -> None:
"""
Initialize Flask app context.
Args:
flask_app: The Flask application instance
"""
self._flask_app = flask_app
def get_config(self, key: str, default: Any = None) -> Any:
"""Get configuration value from Flask app config."""
return self._flask_app.config.get(key, default)
def get_extension(self, name: str) -> Any:
"""Get Flask extension by name."""
return self._flask_app.extensions.get(name)
@contextmanager
def enter(self) -> Generator[None, None, None]:
"""Enter Flask app context."""
with self._flask_app.app_context():
yield
@property
def flask_app(self) -> Flask:
"""Get the underlying Flask app instance."""
return self._flask_app
def capture_flask_context(user: Any = None) -> IExecutionContext:
"""
Capture current Flask execution context.
This function captures the Flask app context and contextvars from the
current environment. It should be called from within a Flask request or
app context.
Args:
user: Optional user object to include in context
Returns:
IExecutionContext with captured Flask context
Raises:
RuntimeError: If called outside Flask context
"""
# Get Flask app instance
flask_app = current_app._get_current_object() # type: ignore
# Save current user if available
saved_user = user
if saved_user is None:
# Check for user in g (flask-login)
if hasattr(g, "_login_user"):
saved_user = g._login_user
# Capture contextvars
context_vars = contextvars.copy_context()
return FlaskExecutionContext(
flask_app=flask_app,
context_vars=context_vars,
user=saved_user,
)
@final
class FlaskExecutionContext:
"""
Flask-specific execution context.
This is a specialized version of ExecutionContext that includes Flask app
context. It provides the same interface as ExecutionContext but with
Flask-specific implementation.
"""
def __init__(
self,
flask_app: Flask,
context_vars: contextvars.Context,
user: Any = None,
) -> None:
"""
Initialize Flask execution context.
Args:
flask_app: Flask application instance
context_vars: Python contextvars
user: Optional user object
"""
self._app_context = FlaskAppContext(flask_app)
self._context_vars = context_vars
self._user = user
self._flask_app = flask_app
@property
def app_context(self) -> FlaskAppContext:
"""Get Flask app context."""
return self._app_context
@property
def context_vars(self) -> contextvars.Context:
"""Get context variables."""
return self._context_vars
@property
def user(self) -> Any:
"""Get user object."""
return self._user
def __enter__(self) -> "FlaskExecutionContext":
"""Enter the Flask execution context."""
# Restore context variables
for var, val in self._context_vars.items():
var.set(val)
# Save current user from g if available
saved_user = None
if hasattr(g, "_login_user"):
saved_user = g._login_user
# Enter Flask app context
self._cm = self._app_context.enter()
self._cm.__enter__()
# Restore user in new app context
if saved_user is not None:
g._login_user = saved_user
return self
def __exit__(self, *args: Any) -> None:
"""Exit the Flask execution context."""
if hasattr(self, "_cm"):
self._cm.__exit__(*args)
@contextmanager
def enter(self) -> Generator[None, None, None]:
"""Enter Flask execution context as context manager."""
# Restore context variables
for var, val in self._context_vars.items():
var.set(val)
# Save current user from g if available
saved_user = None
if hasattr(g, "_login_user"):
saved_user = g._login_user
# Enter Flask app context
with self._flask_app.app_context():
# Restore user in new app context
if saved_user is not None:
g._login_user = saved_user
yield
def init_flask_context() -> None:
"""
Initialize Flask context capture by registering the capturer.
This function should be called during Flask application initialization
to register the Flask-specific context capturer with the core context module.
Example:
app = Flask(__name__)
init_flask_context() # Register Flask context capturer
Note:
This function does not need the app instance as it uses Flask's
`current_app` to get the app when capturing context.
"""
register_context_capturer(capture_flask_context)